Mehdi also tweeted that Windows 10 has seen more than six times the number of app downloads per device from the Windows Store than Windows 8 did. He also said more than 90,000 unique PC and tablet models have upgraded to Windows 10 to date.

Microsoft began making Windows 10 available to Windows 7, 8 and 8.1 users as a free upgrade for consumers and some business customers on July 29. Those who don't qualify for the free upgrade and are not covered by a volume license with Software Assurance can opt to buy Windows 10 Home for $119 and/or Windows 10 Pro for $199.

Windows 10 is available in a handful of various editions, the primary four of which are Home, Pro, Enterprise and Education.

Since the July 29 launch, Microsoft has released four Cumulative Updates for Windows 10 with a variety of fixes, security updates and features. Microsoft is disclosing publicly very little about specific fixes in these updates.

Microsoft officials have said the company's goal is to see Windows 10 installed on 1 billion devices by late summer 2018. That total includes not just the already released Windows 10 for PCs and tablets, but also Windows 10 Mobile for phones, Windows 10 on Internet of Things devices and Windows 10 on Xbox One.

On a somewhat related note, Microsoft has published a "Windows 10 and Privacy" page, which includes lots of questions and answers about its privacy policies around Windows 10 and related services. Microsoft's new privacy policy and services agreement have come under fire by many who claim the company's updated terms and settings potentially violate users' privacy rights.